{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

ClosedSystem

# ClosedSystem - ME 201 Thermodynamics First Law for Closed...

This preview shows pages 1–2. Sign up to view the full content.

1 ME 201 Thermodynamics First Law for Closed Systems Guide Recall that for a closed system there are no mass inflows or mass outflows, so the mass of the closed system remains constant throughout the process or m = m 1 2 Also, due to our quasi-static equilibrium assumption, we can not have any shaft work out of a closed system. We can re-write our 1st law equation as W - W - Q = ) e - m(e bnd sh 1 2 For most closed systems we can neglect kinetic energy and potential energy changes. We call these simple closed systems and can write our energy conservation as W - W - Q = ) u - m(u bnd sh 1 2 Some examples of simple closed systems include Piston-Cylinder System Rigid Tank or Container Balloon In solving simple closed system problems, we need to identify the unknowns, so we will know how to proceed. The possible unknowns are Heat Transfer Shaft Work Boundary Work Initial State (State 1) Final State (State 2) We first observe that heat transfer and shaft work can only be calculated from the first law. This means only one of them can be unknown. If shaft work is not explicitly

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 2

ClosedSystem - ME 201 Thermodynamics First Law for Closed...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online